NEW YORK — An Egyptian Islamic preacher whose fiery sermons before and after 9/11 attracted extremists to his London mosque was convicted Monday in a trial that a prosecutor said should provide justice for the victims of a kidnapping in Yemen more than a decade ago.

The cleric, Mustafa Kamel Mustafa, 55, was found guilty in federal court in Manhattan.

The verdict came just weeks after al-Qaeda’s spokesman following the September 11 attacks was convicted. Attorney General Eric Holder championed that verdict as a triumph for civil courts.

Mustafa was accused of providing material support to terrorist organizations by enabling hostage takers in the Yemen kidnapping to speak on a satellite phone, by sending men to establish an al-Qaeda training camp in Bly, Oregon, and by sending at least one man to training camps in Afghanistan.

He was extradited in 2012 from England, where he led London’s Finsbury Park Mosque in the 1990s, reportedly attended by both September 11 conspirator Zacarias Moussaoui and shoe bomber Richard Reid. Mustafa denied that he ever met them.

Mustafa looked straight ahead as the verdict was read.

For much of the past month, jurors watched videotapes and heard audio clips in which Mustafa shouted to his followers, telling them non-Muslims could be treated like animals and women and children who were not Muslim could be taken captive.

But they saw a gentler version of Mustafa on the witness stand, one who spoke confidently in the tone of a college professor as he insisted he never engaged in acts of terrorism or aided al-Qaeda.

His testimony over four days was derided by Assistant US Attorney Ian McGinley, who told jurors to ignore his lies and concentrate on evidence.

In his closing argument, McGinley read aloud the names of four European tourists who died in 1998 in Yemen after their convoy of cars was overtaken by extremist Islamic kidnappers whom Mustafa had given the satellite phone. McGinley said a guilty verdict would provide a measure of justice for them and another dozen hostages who survived.

“Don’t be fooled by his testimony,” McGinley said. “Don’t let the passage of time diminish what he did.”

Referred by prosecutors and defense lawyers alike by his alias, Abu Hamza al-Masri, Mustafa also explained how he lost both hands and part of his forearms in a 1993 accident when he helped the Pakistani military as a civil engineer.

Two women who were hostages in Yemen also testified. Margaret Thompson, of Texas, who was shot in the leg in a shootout between Yemeni forces and the kidnappers, limped into the courtroom to describe her harrowing 24-hour ordeal.

Mary Quin, a US citizen who now lives in New Zealand, testified that she escaped one kidnapper by putting her foot against his head and wrestling away his assault rifle after he was knocked to the ground by a bullet.

The government played clips of a taped interview Quin conducted with Mustafa in his London mosque as she prepared to write a book about the kidnapping. McGinley told jurors Mustafa boasted to Quin about the kidnappings, saying: “Islamically, it is a good thing.” McGinley said that statement belied Mustafa’s claims that when he spoke to the lead kidnapper during the crisis, he tried to be a peacemaker.

“No one who actually tried to be a peacemaker would say to a victim of that kidnapping that it was a good thing,” he said.

The prosecutor acknowledged Mustafa’s speaking skills, saying he was “good with words,” but also warned, “Don’t buy it.”

“The real Abu Hamza is not the man you see in 2014,” McGinley said.

In his closing, defense attorney Jeremy Schneider warned jurors not to let their judgment be overrun by the emotion of the terrorist acts they heard about repeatedly, including the 2000 bombing of the USS Cole that killed 17 American sailors and the September 11 attacks a year later, the memorial for which opened blocks from the courtroom during the trial.

“The vast majority of the evidence is his words, not his deeds,” he said, adding that his client’s statements were taken out of context.

“Many times, his words aren’t connected to what he did,” Schneider said.

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